Operational safety and a high level of efficiency to provide the appropriate thermal comfort – these are the most important requirements for a system. Especially with modern regulations, the desired room temperatures can be achieved very precisely but the result are often changing flows and pressures in the system.

For installations with static valves only a single operating status can be set optimally. This is usually the condition at full-load operation. During a year of operation, however, both heating and cooling systems work only for a few days in full-load operation. The predominant amount of operating time normally occurs in the partial-load range.

Dynamic control and regulating valves are used to run systems efficiently in all load ranges. They react independently to changing flow rate and pressure conditions and supply all parts of the system with the required amount of energy at any time.

HERZ offers a wide range of dynamic control and regulating valves: HERZ differential pressure controllers are available from DN 15 to DN 150. There are models with adjustable differential pressure range, with a fixed differential pressure setpoint as well as versions with connection threads for actuator drives. A special product highlight are the HERZ pressure-independent control valves (PICV), fully pressure-independent, automatic control and regulating valves. They combine the features of a regulating valve, a control valve, an isolation valve and a differential pressure controller. Furthermore they are easy to operate because only the desired flow rate has to be set. HERZ pressure-independent control valves are available from DN 15 to DN 200 and cover a flow range from 20 l/h to 350,000 l/h.